<template>
  <div>
    <!-- 面包屑 -->
    <el-breadcrumb>
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片 -->
    <el-card>
      <!-- 消息提示 -->
      <el-alert title="添加商品信息" type="info" show-icon center :closable="false">
      </el-alert>

      <!-- 步骤条 -->
      <!-- activeIndex-0  将字符串转换为数字型 -->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tag标签 -->
      <!-- activeIndex 是字符串类型的 -->
      <el-form :model="addForm" :rules="addFormRule" ref="addFormRef" label-width="100px" label-position='top'>
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave='beforeLeave' @tab-click='tabClick'>
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <!-- 级联选择器 -->
              <el-cascader v-model="addForm.goods_cat" :options="this.cateList" :props="goodsProps"
                @change="handleChange">
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- form 表单项 -->
            <el-form-item :label="item.attr_name" v-for="(item) in this.manyTableData" :key="item.attr_id">
              <!-- 参数 复选框 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="(item) in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- 图片上传 -->
            <el-upload :action="actionURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture"
              :headers="headersObj" :on-success="handelSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button type="primary" class="addBtn" @click="addIntroduction">添加内容</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="提示" :visible.sync="picDialogVisible" width="50%">
      <img class="img_preview" :src="picSrc" alt="">
    </el-dialog>
  </div>
</template>

<script>
  import _ from 'lodash'

  export default {
    data() {
      return {
        activeIndex: '0',
        // 添加商品的数据表单
        addForm: {
          goods_name: '',
          goods_price: 0,
          goods_weight: 0,
          goods_number: 0,
          goods_cat: [],
          pics: [],
          goods_introduce: "",
          attrs: []
        },
        // 添加商品的数据表单的规则
        addFormRule: {
          goods_name: [{
            required: true,
            message: '请输入商品名称',
            trigger: 'blur'
          }],
          goods_price: [{
            required: true,
            message: '请输入商品价格',
            trigger: 'blur'
          }],
          goods_weight: [{
            required: true,
            message: '请输入商品重量',
            trigger: 'blur'
          }],
          goods_number: [{
            required: true,
            message: '请输入商品数量',
            trigger: 'blur'
          }],
          goods_cat: [{
            required: true,
            message: '请输入商品分类',
            trigger: 'blur'
          }]
        },
        // 分类列表
        cateList: [],
        // 级联选择器的配置选项
        goodsProps: {
          expandTrigger: 'hover',
          value: 'cat_id',
          label: 'cat_name',
          children: 'children'
        },
        // 动态参数列表
        manyTableData: [],
        // 静态属性列表
        onlyTableData: [],
        // 图片上传发URL地址
        actionURL: "http://127.0.0.1:8888/api/private/v1/upload",
        // 上传图片时要手动添加token
        headersObj: {
          Authorization: window.sessionStorage.getItem('token')
        },
        // 图片预览的显示与隐藏
        picDialogVisible: false,
        // 图片预览的图片路径
        picSrc: "",
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      // 获取商品分类数据列表
      async getCateList() {
        const {
          data: res
        } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类数据列表失败')
        }
        this.cateList = res.data
        console.log(this.cateList);
      },
      // 级联选择器 选中节点发生变化时触发
      handleChange() {
        console.log(this.addForm.goods_cat);
        // 实现只能选择三级分类
        if (this.addForm.goods_cat.length < 3) {
          this.addForm.goods_cat = []
        }
      },
      // 标签切换之前的钩子函数  
      beforeLeave(activeName, oldActiveName) {
        // console.log("activeName:", activeName);
        // console.log("oldActiveName:", oldActiveName);
        if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
          this.$message.error('请选择商品分类')
          return false
        }
      },
      // tab被选中时触发  
      async tabClick() {
        // console.log(this.activeIndex);
        // 证明访问的是动态参数面板
        if (this.activeIndex === '1') {
          const {
            data: res
          } = await this.$http.get(`categories/${this.cateId}/attributes`, {
            params: {
              sel: 'many'
            }
          })
          if (res.meta.status !== 200) {
            return this.$message.error('获取动态参数失败')
          }
          // 将attr_vals 中的字符串转换为数组  循环以空格分隔为数组
          res.data.forEach(item => {
            item.attr_vals == 0 ? '' : item.attr_vals = item.attr_vals.split(' ')
          })
          this.manyTableData = res.data
          console.log(this.manyTableData);
        }
        // 访问的是静态属性面板
        if (this.activeIndex === '2') {
          const {
            data: res
          } = await this.$http.get(`categories/${this.cateId}/attributes`, {
            params: {
              sel: 'only'
            }
          })
          if (res.meta.status !== 200) {
            return this.$message.error('获取静态属性失败')
          }
          this.onlyTableData = res.data
          console.log(this.onlyTableData);
        }
      },
      // 点击图片名字时触发
      handlePreview(file) {
        console.log(file);
        this.picSrc = file.response.data.url
        this.picDialogVisible = true
      },
      // 文件列表移除文件时的钩子
      handleRemove(file) {
        // 1. 获取将要删除的图片的临时路径
        const filePath = file.response.data.tmp_path
        // 2. 从 pics 数组中，找到这个图片对应的索引值
        const index = this.addForm.pics.findIndex(item => item.pic === filePath)
        // 3. 调用数组的 splice 方法，移除要删除达到图片
        this.addForm.pics.splice(index, 1)
        // console.log(this.addForm);
      },
      // 图片上传成功后触发
      handelSuccess(data) {
        console.log(data);
        const path = {
          "pic": `${data.data.tmp_path}`
        }
        this.addForm.pics.push(path)
        // console.log(this.addForm);
      },
      addIntroduction() {
        // console.log(this.addForm.goods_introduce);
        // 表单预验证
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) {
            this.$message.error("请输入必要的文本项！")
          }
          // 将 goods_cat 从 数组 转变为 字符串
          // 深拷贝 addForm (因为级联选择器只接受数组)
          const form = _.cloneDeep(this.addForm)
          form.goods_cat = form.goods_cat.join(',')
          // 处理动态参数
          this.manyTableData.forEach(item => {
            const newInfo = {
              "attr_id": item.attr_id,
              "attr_value": item.attr_vals.join(' ')
            }
            this.addForm.attrs.push(newInfo)
          })
          // 处理静态参数
          this.onlyTableData.forEach(item => {
            const newInfo = {
              "attr_id": item.attr_id,
              "attr_value": item.attr_vals
            }
            console.log(newInfo);
            this.addForm.attrs.push(newInfo)
          })
          form.attrs = this.addForm.attr_vals
          // 提交网络请求
          const {
            data: res
          } = await this.$http.post('goods', form);
          console.log(res);
          if (res.meta.status !== 201) {
            return this.$message.error('信息提交失败')
          }
          this.$message.success("信息提交成功")
          this.$router.push('/goods')
        })
      }
    },
    computed: {
      cateId() {
        if (this.addForm.goods_cat.length === 3) {
          return this.addForm.goods_cat[2]
        }
        return null
      }
    }
  }

</script>

<style lang="less" scoped>
  .el-checkbox {
    margin: 0px 10px 0px 0px !important;
  }

  .img_preview {
    width: 100%;
  }

  .addBtn {
    margin-top: 15px;
  }

</style>
